CN210041837U - Wireless communication system based on LED visible light - Google Patents
Wireless communication system based on LED visible light Download PDFInfo
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- CN210041837U CN210041837U CN201920863012.5U CN201920863012U CN210041837U CN 210041837 U CN210041837 U CN 210041837U CN 201920863012 U CN201920863012 U CN 201920863012U CN 210041837 U CN210041837 U CN 210041837U
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Abstract
The utility model discloses a wireless communication system based on LED visible light, include the optical transmission circuit who links to each other with the computer through connecting circuit, optical transmission circuit connects gradually light-receiving circuit, filter circuit and amplifier circuit to connect to the computer. The light emitting circuit is connected with the modulation circuit, the LED driving circuit for sending character strings and the audio signal selector through an STM32 control board, and the audio signal selector is connected with the LED driving circuit for sending audio; the light receiving circuit receives signals through a photosensitive element on the receiving board, and the RXD of the USB-to-serial port module sends the acquired electrical signals to a computer. The system can realize low-noise and high-gain output of signals; and the optical device has low cost and is suitable for popularization and application.
Description
Technical Field
The utility model belongs to the technical field of visible light communication, concretely relates to communication transmission technology based on LED visible light carries out video, audio frequency and character string.
Background
In recent years, the communication technology industry has been vigorously developed, and digital communication is gradually replacing analog communication. However, conventional digital communication has many disadvantages, such as:
microwave communication: with the increasing use of microwaves, transmission areas overlap with each other, and much interference is generated.
Network communication: there are adjacent channel interference, co-channel interference, etc.
Satellite communication: when objects such as large buildings or mountains cover the equipment, communication signals are unstable.
Optical fiber communication: the problems of shunt, inflexible coupling, difficult power supply and the like exist.
Compared with the traditional digital communication mode and visible light communication carried out by using a common light source, the LED white light communication technology has the following outstanding advantages:
1. the LED white light is natural light, is very safe to a human body, and cannot generate adverse effects on the human body when the indoor LED illuminating lamp is used for data communication.
2. The application range is extremely wide: the lighting system is used in all places such as families, offices and the like, which are wide market application scenes of LED white light communication, and the LED white light communication can be realized by the aid of ubiquitous lighting systems for high-speed wireless data communication; the system is not limited by radio spectrum control and has no electromagnetic interference, and can be applied to occasions with strict limitation on electromagnetic interference, such as hospitals, airplanes, space stations and the like.
3. The transmission power is high. In the conventional rf communication system, high-power rf signals are very harmful to human body, so that its transmission power cannot be increased without limit. In the infrared communication system, infrared rays are very harmful to human eyes, so that the transmission power thereof is also low. However, white LED light has no adverse effect on the human body, and high power emission can be used within a range acceptable to the human eye.
4. The safety performance is excellent. The visible light penetration ability is poor, so that the leakage can be prevented through the shading devices such as curtains and the like, and the communication safety is realized; is very safe to human beings and can not bring potential hidden troubles to human health.
5. No radio spectrum authentication is required. At present, the radio spectrum resources are quite limited and the available radio frequencies are severely insufficient.
SUMMERY OF THE UTILITY MODEL
The utility model aims to utilize modules such as LED drive circuit, light receiving circuit, amplifier circuit to realize the visible light communication system that can satisfy certain speed and transmission distance.
In order to achieve the above object, the embodiments of the present invention adopt the following technical solutions:
according to the utility model provides an embodiment, the utility model provides a wireless communication system based on LED visible light, include:
a computer for transmitting to the light emitting circuit and receiving the electric signal from the light receiving circuit;
the light emitting circuit is used for controlling the on-off of the LED lamp;
the light receiving circuit is used for converting the optical signal sent by the light emitting circuit into an electric signal through the photodiode and filtering the electric signal;
the amplifier circuit is used for amplifying the filtered electric signal and transmitting the amplified electric signal to the computer;
the computer is connected with the light emitting circuit, the light receiving circuit and the amplifier circuit and is connected to the computer;
the light emitting circuit comprises an STM32 control board and a modulation circuit, wherein the STM32 control board is connected with the modulation circuit, the modulation circuit is respectively connected with an LED driving circuit for sending character strings and an audio signal selector, and the audio signal selector is connected with an LED driving circuit for sending audio;
the light receiving circuit comprises an audio and video receiving circuit and a character string receiving circuit which are connected with the light emitting circuit, the audio and video receiving circuit and the character string receiving circuit are sequentially connected with a modulation circuit and an STM32F control panel, and a USB (universal serial bus) to serial port chip is connected to a receiving terminal.
Preferably, the LED driving circuit for transmitting the character string includes a transistor Q1 connected to the embedded serial server, a base of the transistor Q1 is connected to the embedded serial server, an emitter is connected to a 3.3v power supply, a collector is connected to a light emitting diode C, and a terminal of the light emitting diode C is grounded.
Preferably, the LED driving circuit for transmitting audio comprises a transistor Q2, a base of the transistor Q2 is connected with a resistor R18, a collector is connected with a 5v power supply, an emitter and the light emitting diode AV are commonly connected with a serial port P6, the resistor R18 is connected in parallel with the collector of the transistor Q2 and the light emitting diode AV, and the anode of the light emitting diode AV is grounded.
Preferably, the STM32 control board is connected with a power supply and a voltage converter.
Preferably, the character string receiving circuit comprises an operational amplifier, wherein the same-direction input end of the operational amplifier is connected with a resistor R15, the reverse-direction input end of the operational amplifier is connected with a resistor R14, a resistor R15 is connected with a photodiode and is connected with the resistor R14 in parallel on the operational amplifier, and the output end of the operational amplifier is connected with a photodiode D7 and a resistor R13 and is connected with a 3.3-volt power supply.
Preferably, the USB-to-serial port chip is a CH340G USB-to-serial port chip, and the USB port of the computer is converted into an STM32F103C8T6 serial port.
Preferably, the amplifier circuit adopts an OPA2846 double-path broadband low-noise voltage feedback operational amplifier.
The utility model is characterized in that: the LED communication method can fully play incomparable superiority of the LED: extremely short response time, extremely wide application range, extremely high transmitting power and extremely good safety performance; the receiving plate and the transmitting plate are provided with USB-to-serial port chips, so that the application range is expanded in a large range, and devices compatible with USB interfaces can communicate through the utility model; the design of a series of amplifiers and inductance-capacitance circuits can realize low-noise and high-gain output of signals; compare in the high cost of traditional communication equipment, the utility model discloses an optical device low price, greatly reduced the cost.
Drawings
FIG. 1 is a schematic diagram of a configuration of an LED visible light communication system;
FIG. 2 is a schematic diagram of a light emitting circuit of the LED visible light communication system;
FIGS. 3(a), (b) are schematic diagrams of an LED driving circuit for transmitting a character string and an LED driving circuit for transmitting audio, respectively;
FIG. 4 is a schematic diagram of a light receiving circuit of the LED visible light communication system;
FIG. 5 is a schematic diagram of a string receiving circuit of the LED visible light communication system.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, a wireless communication system based on LED visible light includes a light emitting circuit connected to a computer through a connection circuit, the light emitting circuit being connected to a light receiving circuit, a filter circuit, and an amplifier circuit in this order, and being connected to the computer.
The computer is used for converting data to be sent into an electric signal form through the CH340G USB port chip, transmitting the electric signal to the light emitting circuit, and receiving the electric signal from the light receiving circuit through the CH340G USB port chip.
The light emitting circuit, as shown in fig. 2, includes a power supply, a voltage converter, an STM32 control board and a modulation circuit connected in sequence, the modulation circuit is connected to an LED driving circuit for transmitting character strings and an audio signal selector, respectively, and the audio signal selector is connected to the LED driving circuit for transmitting audio. The light emitting circuit takes an STM32F103C8T6 development board as a core, and the LED emits a light pulse signal which is on and off and flickers at a high speed through the change of the high and low levels of the LED and emits the light pulse signal.
As shown in fig. 3(a), the LED driving circuit for transmitting the character string includes a transistor Q1 connected to the embedded serial server, a base of the transistor Q1 is connected to the embedded serial server, an emitter is connected to a 3.3v power supply, a collector is connected to a light emitting diode C, and a terminal of the light emitting diode C is grounded.
As shown in fig. 3(b), the LED driving circuit for transmitting audio includes a transistor Q2, a base of the transistor Q2 is connected to a resistor R18, a collector is connected to a 5v power supply, an emitter and the LED AV are commonly connected to a serial port P6, a resistor R18 is connected in parallel to the collector of the transistor Q2 and the LED AV, and an anode of the LED AV is grounded.
The LED drive circuit for sending the character string and the LED drive circuit for sending the audio apply the electronic signal from the STM32 control panel to the triode, so as to control the LED to flicker at a high speed which can not be distinguished by naked eyes, and finally emit the electronic signal. When the LED driving circuit is used, an electric signal is input into the driving circuit, and the driving circuit is connected with an STM32 control board.
As shown in fig. 4, the optical receiving circuit uses an STM32F103C8T6 control board as a core, and includes an audio and video receiving circuit and a character string receiving circuit respectively connected to an LED driving circuit for transmitting a character string and an LED driving circuit for transmitting audio, and receives an optical communication signal transmitted by an LED through a photosensitive element. Audio, video receiving circuit and character string receiving circuit connect gradually mediation circuit and STM32F103C8T6 control panel, are connected with USB commentaries on classics serial chips and 5V power on the STM32F103C8T6 control panel, and the 5V power passes through voltage conversion circuit and converts the 5V power into the 3.3V power, and USB commentaries on classics serial chips is connected to receiving terminal.
As shown in fig. 5, the burst receiving circuit for the LED visible light communication system includes an operational amplifier, the same-direction input terminal of the operational amplifier is connected to a resistor R15, the reverse-direction input terminal thereof is connected to a resistor R14, a resistor R15 is connected to a photodiode, and is connected to the operational amplifier in parallel with the resistor R14, and the output terminal of the operational amplifier is connected to a photodiode D7 and a resistor R13, and is connected to a 3.3v power supply.
The operational amplifier is an OPA2846 (dual-channel broadband low-noise voltage feedback operational amplifier) series amplifier for filtering noise and impurity waves and realizing low-noise and high-gain output of signals, and the operational amplifier realizes low-noise and high-gain output of the signals.
The USB-to-serial port chip is a CH340G USB-to-serial port chip, and the USB port of a computer is converted into an STM32F103C8T6 serial port to realize modulation of character strings.
After the character string signal is transmitted through the transmitting plate, the signal is received through a photosensitive element on the receiving plate, and meanwhile, the demodulation work of the signal is realized through full-wave rectification, low-pass filtering and sampling judgment.
The light receiving circuit selects a commonly used voltage comparison chip LM339 to form a voltage comparator, the magnitude of the judgment voltage is changed by adjusting the resistance value of the potentiometer R1, when the voltage of an input signal is greater than the judgment voltage, the output is high level, and when the voltage of the input signal is less than the judgment voltage, the output is low level. The chip of the sampling decision selects SN74HC 74N. When the clock signal is a rising edge, the output signal is the same as the input signal and remains unchanged until the next rising edge.
In an optical communication system, a receiver functions to convert an optical signal from an LED driving circuit into an electrical signal. Wherein first the photodiode converts the light signal flashing at high speed into an electrical signal. Then the electrical signal is input to a voltage comparator, and in the specific implementation, the RXD of the USB-to-serial port module sends the acquired electrical signal to a computer.
In specific implementation, the computer for inputting signals to the LED driving circuit and the computer for RXD to acquire signals and transmit the signals to may be the same computer or different computer devices.
The present invention is not limited to the above embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some replacements and transformations for some technical features without creative labor according to the disclosed technical contents, and these replacements and transformations are all within the protection scope of the present invention.
Claims (7)
1. An LED visible light based wireless communication system, comprising:
a computer for transmitting to the light emitting circuit and receiving the electric signal from the light receiving circuit;
the light emitting circuit is used for controlling the on-off of the LED lamp;
the light receiving circuit is used for converting the optical signal sent by the light emitting circuit into an electric signal through the photodiode and filtering the electric signal;
the amplifier circuit is used for amplifying the filtered electric signal and transmitting the amplified electric signal to the computer;
the computer is connected with the light emitting circuit, the light receiving circuit and the amplifier circuit and is connected to the computer;
the light emitting circuit comprises an STM32 control board and a modulation circuit, wherein the STM32 control board is connected with the modulation circuit, the modulation circuit is respectively connected with an LED driving circuit for sending character strings and an audio signal selector, and the audio signal selector is connected with an LED driving circuit for sending audio;
the light receiving circuit comprises an audio and video receiving circuit and a character string receiving circuit which are connected with the light emitting circuit, the audio and video receiving circuit and the character string receiving circuit are sequentially connected with a modulation circuit and an STM32F control panel, and a USB (universal serial bus) to serial port chip is connected to a receiving terminal.
2. The LED visible light-based wireless communication system according to claim 1, wherein the LED driving circuit for transmitting the character string comprises a transistor Q1 connected with the embedded serial server, a base of the transistor Q1 is connected with the embedded serial server, an emitter of the transistor Q1 is connected with a 3.3V power supply, a collector of the transistor Q1 is connected with a light emitting diode C, and a C end of the light emitting diode C is grounded.
3. The LED visible light-based wireless communication system according to claim 1, wherein the LED driving circuit for transmitting audio comprises a transistor Q2, a base of the transistor Q2 is connected with a resistor R18, a collector of the transistor Q2 is connected with a 5V power supply, an emitter of the transistor and the LED AV are commonly connected with a serial port P6, a resistor R18 is connected in parallel with a collector of the transistor Q2 and the LED AV, and an anode of the LED AV is grounded.
4. The LED visible-light based wireless communication system of claim 1, wherein a power supply and voltage converter are connected to the STM32 control board.
5. The LED visible light-based wireless communication system according to claim 1, wherein the burst receiving circuit comprises an operational amplifier, the same-direction input end of the operational amplifier is connected with a resistor R15, the reverse-direction input end of the operational amplifier is connected with a resistor R14, a resistor R15 is connected with a photodiode and is connected with the resistor R14 in parallel on the operational amplifier, and the output end of the operational amplifier is connected with a photodiode D7 and a resistor R13 and is connected with a 3.3V power supply.
6. The LED visible light-based wireless communication system according to claim 1, wherein the USB to serial chip is a CH340G USB to serial chip, and the USB port of the computer is converted into an STM32F103C8T6 serial port.
7. The LED visible-light based wireless communication system of claim 1, wherein the amplifier circuit employs an OPA2846 dual broadband low noise voltage feedback operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920863012.5U CN210041837U (en) | 2019-06-10 | 2019-06-10 | Wireless communication system based on LED visible light |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920863012.5U CN210041837U (en) | 2019-06-10 | 2019-06-10 | Wireless communication system based on LED visible light |
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| CN210041837U true CN210041837U (en) | 2020-02-07 |
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| CN201920863012.5U Active CN210041837U (en) | 2019-06-10 | 2019-06-10 | Wireless communication system based on LED visible light |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114422030A (en) * | 2022-03-29 | 2022-04-29 | 天津七一二移动通信有限公司 | Half-duplex audio transmission device based on LIFI technology and implementation method |
| CN115037370A (en) * | 2022-06-08 | 2022-09-09 | 苏州大学 | Device of visible light transmission character based on STM32 singlechip |
-
2019
- 2019-06-10 CN CN201920863012.5U patent/CN210041837U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114422030A (en) * | 2022-03-29 | 2022-04-29 | 天津七一二移动通信有限公司 | Half-duplex audio transmission device based on LIFI technology and implementation method |
| CN115037370A (en) * | 2022-06-08 | 2022-09-09 | 苏州大学 | Device of visible light transmission character based on STM32 singlechip |
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